Job No. 1 for the new CEO: Revamp the stagnating microblogging service to make it more inviting for regular folks.
Apple's chief design guru shares insight into what it was like to collaborate with Apple's co-founder.
Apple is selling fewer MacBooks and iMacs, according to analyst IDC, but declining PC sales across the board means the company actually occupies a larger slice of the market.
From CNET Magazine: Smartphones, online services and biometric scanners are already easing the way for travelers. Expect even more tech to transform your journeys in the not-too-distant future.
James Bell, who worked for the aircraft maker for 38 years, becomes Apple's sole African-American director.
South Korea's biggest messaging app is struggling to keep profits up despite increasing popularity, signalling what could be a problem for the global messaging sector.
Classic real-estate board game given post-apocalyptic makeover.
It's the hottest tech toy of 2015. You can call it a hoverboard, a Segway or a self-balancing board. It's just cool.
Costolo will reportedly relinquish his seat on the board of directors once a new full-time CEO is found, or by year's end.
Jack Dorsey is now CEO of both Twitter and Square. Running one big company is tough. Now he has two.